Placement jigs for osteosynthesis systems and related methods

A placement jig having a jig body, the jig body comprising:

• a distal portion including a press fit surface configured to be received through a plate passageway of an anterior cervical plate and to be removably coupled to an interbody inner surface of an interbody by a press fit coupling at first and second press fit positions, wherein the interbody is disposed in an intervertebral space and secured to first and second vertebrae, wherein the distal portion is configured to translate along a longitudinal axis of the placement jig from the first press fit position to the second press fit position relative to the interbody inner surface, and the second press fit position is disposed at a deeper depth within the interbody than the first press fit position;
• a proximal portion including lateral contact surfaces having a lateral width configured to be larger than a lateral width of the plate passageway and the proximal portion configured to abut against a plate body of the anterior cervical plate, wherein the plate body includes a rear surface configured to abut against the first and the second vertebrae, a front surface opposite the rear surface, a plate inner surface connecting the front and the rear surfaces, wherein the plate inner surface forms the plate passageway;
• and
• a medial portion connecting the distal portion to the proximal portion and configured to be received through the plate passageway,
• wherein in the second press fit position the interior cervical plate is configured to abut against the proximal portion and against the first and the second vertebrae.

A method, comprising:

• receiving a distal portion of a jig body of a placement jig through a plate passageway of an anterior cervical plate, wherein a plate body of the anterior cervical plate includes
• a rear surface configured to abut against first and second vertebrae,
• a front surface opposite the rear surface, and
• a plate inner surface connecting the front and the rear surfaces, wherein the plate inner surface forms the plate passageway;
• removably coupling, by a press fit coupling, a press fit surface of the distal portion to an interbody inner surface of an interbody at a first press fit position, wherein the interbody is disposed in an intervertebral space and secured to the first and the second vertebrae;
• and
• applying an insertion force to the placement jig to translate the distal portion along a longitudinal axis of the placement jig from the first press fit position to a second press fit position relative to the interbody inner surface, wherein the second press fit position is disposed at a deeper depth within the interbody than the first press fit position, wherein in the second press fit position the anterior cervical plate abuts against lateral contact surfaces of a proximal portion of the jig body and against the first and the second vertebrae,
• wherein the proximal portion includes a lateral width larger than a lateral width of the plate passageway, and wherein a medial portion of the jig body connects the distal portion to the proximal portion.